Guaranty Bank and Trust Company ← View details 401 Main Street, Longmont, CO 80501 +1 303-678-4140 guarantybankco.com Suggest an Edit Name* State* Locality* ZIP* Street address* Phone* Website Opening hours Monday: 08:30 am — 05:00 pm Tuesday: 08:30 am — 05:00 pm Wednesday: 08:30 am — 05:00 pm Thursday: 08:30 am — 05:00 pm Friday: 08:30 am — 05:00 pm Your comments * — Required information